The influence of river functionality on habitat selection by Ephemeroptera in spatially and temporally diverse lowland rivers, with particular reference to the River Bug

• Published in: Oceanological and hydrobiological studies Vol. 38; no. 2; pp. 63 - 76
• Main Authors: Głazaczow, Adam, Orwin, David, Bajaczyk, Rafał
• Format: Journal Article
• Language: English
• Published: Berlin Versita 01.06.2009; Walter de Gruyter GmbH
• Subjects: Ametropus; Animal behavior; Aquatic insects; Cercobrachys; Environmental changes; Ephemeroptera; Habitat selection; Habitats; Life history; lowland river; Procloeon; psammophilous mayflies; Rivers; sandy substratum
• DOI: 10.2478/v10009-009-0022-8
• ISSN: 1730-413X; 1897-3191

The purpose of this work is the designation of changes in the environmental preferences of mayflies in the prevailing conditions in a large lowland river little changed by human activity. During the study, the occurrence of the following species were recorded: Cercobrachys minutus (54.2%); Procloeon nana (24.5%); Pseudocentroptiloides shadini (7.6%); Ametropus fragilis (2.9%), which were numerously represented and formed a permanent element of the fauna, and Baetopus wartensis (0.1%) and Oligoneurisca borysthenica which were noted very rarely and were accidental species. The differences and similarities in the functionality of the psammophilous and other mayfly assemblages were assessed. The data from the last fifteen years of study was investigated and compared with those from other rivers which were more managed. PCA was used to distinguish the main factors influencing habitat selection at particular stages of life history and the tendency for drifting.